Humans need not apply
This video will hurt
and pretty much everything else by this guy...
CGPgrey is awesome. Really active on Reddit, too. I believe he even has his own subreddit and all.
Some of his videos are really informative and quite nice. On a sidenote, i did put on the headphones but didn't really get nothing on the headache thing. Maybe i'm weird?
There is, however, an interesting video about sound that DOES work:
https://www.youtube.com/watch?v=U_GrIzcxClMIt's a high-pitched sound that older people simply lose the ability to hear. I tested it with my mother and father, and both could DEFINITELY NOT hear anything from the video, even though my sister and i could hear it very clearly. Recommended to be tested with a headphone.
ALSO THIS:
http://www.noiseaddicts.com/2009/03/can-you-hear-this-hearing-test/I can clearly hear up to 16khz, then 17khz and 18khz i can still hear, but faintly. 19khz i can make up that there is some sort of sound happening, but it's so faint i can BARELY make it out. Above that, it's basically silence.
I'm SO going to test this with my 2YO... He can probably hear up to 22khz.
EDIT2:
https://www.youtube.com/watch?v=h5l4Rt4Ol7M - Another interesting youtube hearing test. In this one, the cutoff for me was at about 16khz. Some of the comments do chalk it up as a limitation of mp3 files not playing sounds above 16khz, so maybe that's why. Regardless, it seems my hearing is NOT as impaired as i thought it might be.
I do like to blast my car stereo as loud as it can go, and it does go loud enough to produce massive ringing in the ears. 4 120W elliptical speakers, 2 40W tweeters, 2 140W subwoofers... And plenty of amplifier power to spare to all that.